Foundation Study Of Iron-based High Temperature Alloy Parts Formed By Plasma Deposition Assisted By Ultrasonic

Metal parts manufacturing by Plasma Thromboplast Antecedent is a important developing direction of repaid shaping. The Plasma Thromboplast Antecedent is a manufacturing technology by the power of high-energy plasma beam. Besides of the advantages of normal RP technology, this technology also has the advantages such as cheap equipment, fast forming speed, can forming messiness parts, the layer and base have typical metallurgical combination, the layer can't break off easily in serving, we can according to service for selecting or design deposition alloy to make the deposition surface get good abrasion resistance, corrosion resistance, temperature tolerance, oxidation resistance, radiation resistance, etc, and in the process of great flexibility. It's one of the ideal and rapid manufacturing methods to realize low cost and short cycle, it has important researching value and broad market prospect.However, the research indicated that many defects such as surface crack, coarse granule and non-uniform organization are existed at the process of the plasma direct deposition forming at present, which restricted its development and application seriously. In view of this, this article proposed the foundation study of iron-based high temperature alloy parts formed by plasma deposition assisted by ultrasonic, take the high temperature iron-based powder as raw material, foundation questions of plasma deposition forming assisted by supersonic are studied systematically, and the following research results has been obtained:(1) Different collisions by different states of powder and depositing layer's interface was analyzed and discussed, the powder's use ratio in the process of deposition was discussed and analyzed by theory.(2) The influence of depositing layer'exterior appearance made by different forming parameters was studied in detail, the result shows that the deposit formation width increases along with the deposition electric current increases, increases along with the deposition rate reduces and increases along with the powder feeding speed increases. But the deposit formation height reduces along with the electric current increases, reduces along with the deposition rate increase and increases along with the powder feeding speed increases. The best combination of deposition forming parameter is the deposition rate probably 60mm/min, the deposition electric current probably 180A and the powder feeding speed approximately 50g/min.(3) The influence of deposit layer'interior organization made by different forming parameters was studied in detail, the result shows that along with the deposition electric current, the deposition rate and the powder feeding speed increase, the organization's refinement is more easily.(4) Under the ultrasonic vibration, the powders are melted fully and the internal organization of the deposit formation became more tinier and uniform, along with supersonic power increase, these functions are more obvious.(5) The supersonic vibration relieved the internal stress of deposit formation solidification process, effectively resolved the crack flaw of the sample.